Mailinglist Archive: opensuse (888 mails)

[Per Jessen <per@xxxxxxxxxxxx>]

Carlos E. R. wrote:

> On 2011-01-06 18:46, Per Jessen wrote:
> > Carlos E. R. wrote:
>
> > > But it is a terrible format!
> >
> > Yes, it is unusual having an IP-address in the URL, normally it would
> > be a name, but the %ethX extension doesn't work with a name (as far
> > as I
> > have seen).  Btw, the FE80::21E:BFF:FE08:4CCB%eth0 format also works
> > with e.g. ssh and telnet.  It is handled by the getaddrinfo()
> > function. I suspect there must be a way of specifying a name plus
> > devicename, but I haven't found it yet.
>
> I meant terrible compared to an IPv4 numerical address. There is no
> need for brackets nor for the interface.

In the normal case, that would be the same for IPv6.  The numerical
address is too long to be really useful by itself.  Using the IPv6
numerical address is an exception, not the norm.

> > > Having to add a 6 to the ping, specify the interface in pings or web
> > > browsing... Perhaps it is a question of routing tables :-?
> >
> > It is a problem specific to link-local addresses - if you were to use
> > global unicast addresses, i.e. "plain" IPv6 addresses, there is no
> > problem.  If you can assign your own IPv6 addresses to the printer,
> > you could try using the fec0 prefix - it's deprecated, but was meant
> > to be site-local.
>
> Well, I certainly want local-only addresses, not global addresses. 

Well, as far as I've understood, that's actually not foreseen in IPv6.
There is a concept of site-local addresses, but it's been deprecated.
IPv6 has enough addresses for everyone. 

> I read somewhere that old v4 addresses could be mapped to new v6
> addresses. Some prefix, then the old 192.168...

Yes, that is true - one of the transition mechanisms is 6to4, where all
IPv4 addresses are mapped into IPv6 as 2002:: - doesn't mean the
private RFC1918 addresses suddenly become public though.

> > > What would happen if I modify my bind dns configuration in an
> > > unfathomable way, so that the returned address for the printer is
> > > the v6 one instead of the v4 one, would I have to write the port
> > > too? That's absurd. It is, isn't it?
> >
> > If you change the A record and make it an AAAA instead with a proper
> > IPv6 address, it'll work just fine.  I tried it with a link-local
> > address, and I couldn't get it to work with the %ethX notation.
>
> No, I don't want to put the eth part :-)
>
> So add an AAAA record. But also add the reverse file somehow, too.

You probably don't have to, but it's just as easy as an IPv4 reverse
map. 

> And I don't need routing tables, because we write the eth0 port in the
> address given to firefox. If I would be using names, how would the
> routing know on which ether port is that MAC address? 

The same it does today for IPv4 - it has a route. 

> Routing tables are done by prefixes common to many machines. Unless
> the operating system does discovery and automatic routing...

It does, just like today. 



-- 
Per Jessen, Zürich (5.4°C)

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